Sarah,
You said, "I found it interesting that he talks of light weight backpacking in the book-27 years ago ;-)"
27 years is nothin'. UL has been around much longer than that, let alone simple light weight backpacking. UL backpacking was revived and revised for new materials by Gerry Cunningham, a school teacher in Boulder, in the early and mid 1960s through about 1980. I still have some of his stuff sold under Gerry Equipment, Inc. He sold the company in the 1980s and went back to teaching and sailing. Look for his book, LIGHTWEIGHT CAMPING EQUIPMENT AND HOW TO MAKE IT. Amazon has it.
Gerry designed and made complete systems: lightweight (for the time) load-control packs (stay frame, no belt); compact butane stoves, down gear and so on. I designed the first polyester bag sold under the Gerry brand. In 1972 or 73, it was probably the first backpackable poly bag sold commercially.
Gerry advocated low weights and used as a goal 18 pounds total weight (including consumables) for a summer's weekend in the Colorado Rockies. The same gear made with the current generation of materials would probably go down to about 10 or 11 pounds.
IOW, Gerry Cunningham was the 60's version of Ray Jardine. UL happened again about 1980 – without a dominant guru. Various makers put out UL packs and other gear. The periodic rebirth and fading away of UL has been of interest to me since the 1970s when I first noticed it. There are economic reasons UL fades — it is not compatible with modern business practice. A few folks keep it alive, then someone writes a persuasive book or article and UL pops back up with a big AH!HA!
When you check Amazon, check my 1980 book LIGHTWEIGHT CAMPING AND HIKING GEAR AND HOW TO MAKE IT. It represents OLD stuff I developed in the 1970s, so I consider it more a curiosity than anything serious.